The improbable scenario in which this set of constraints developed entirely by chance, to allow what we see, is difficult to believe. As are most alternative explanations.
Discussion
As I've already said in other comments, evolution is NOT governed by chance.
Yea I didn't mention evolution. Would not the set of constraints on reality needed to result in what we see necessarily need to arrive by either chance or by design?
The chance part is that we find ourselves in such a condition, among infinite possible conditions. Sure, we could only yak about it here where such things are possible, but it is still improbable from here.